Welch Allyn Connex Spot Monitor Disassembly And Reassembly page 18

Locking Connector
Locking (squeeze-release): Locking connectors use a latching
mechanism to prevent accidental disconnection during
assembly and use. The latch is located on one end of a tab so
it may flex and lock into place when coupled with its matching
connector. The tab provides a lever to release the latch. When
disconnecting, squeeze to provide pressure on the tab to
unlatch. Some connectors have multiple latches that require
you to press multiple tabs to release.
To remove a locking connector, squeeze the release lever and
remove the cable.
To connect a locking connector, push the mating pieces
together until the latch locks in place.